Base station and signal transmission configuration method, and signal measurement device and method therefor

ABSTRACT

The present embodiments relate to a method and device for obtaining location information of a terminal by using a wireless communication system. Provided according to an embodiment is a device for acquiring the location information of a terminal, the device comprising at least one downlink signal receiver, at least one uplink signal receiver, and a controller for controlling the downlink signal receiver and uplink signal receiver, wherein the controller configures uplink resource assignment information on the basis of control information received by the downlink signal receiver and determines whether an uplink signal is received, on the basis of the uplink resource allocation information.

CROSS-REFERENCE TO RELATED APPLICATION(S)

This application is a continuation of U.S. application Ser. No.17/264,383 filed Jan. 29, 2021, which is a national stage application ofInternational Application No. PCT/KR2019/009463 filed Jul. 30, 2019,which claims priority under 35 U.S.C. § 119(a) to Korean PatentApplication No. 10-2018-0088512, filed on Jul. 30, 2018 and KoreanPatent Application No. 10-2019-0091905, filed on Jul. 29, 2019, in theKorean Intellectual Property Office, the disclosures of which areincorporated by reference herein in their entirety.

TECHNICAL FIELD

The present disclosure relates to methods and base stations forperforming a signal transmission configuration, and more specifically,when a terminal is a target terminal whose location is required to bemeasured, to a method and a base station for determining a controlinformation transmission configuration so that a reception performanceof a signal measurement device measuring a location of the targetterminal can be improved.

BACKGROUND ART

Recently, for public services, a third party, not a communicationservice provider, has attempted to acquire a location or movementinformation of terminals placed in a specific area. As an example,public organizations of the Korea Expressway Corporation and the KoreaNational Police Agency have attempted to acquire information such as thenumber or speed of terminals passing through a specific area.

In such a situation, a method of allowing a third party other than acommunication service provider to acquire information on a location ortraffic of terminals placed in a specific area for the purpose of publicservice has not been provided yet. In particular, there is a substantiallimitation that methods of acquiring such information should beimplemented without affecting communication equipment and communicationnetworks which have been already installed. Further, communicationservice providers are desired to estimate a location of terminals moreaccurately.

DETAILED DESCRIPTION OF THE INVENTION Technical Problem

The present disclosure is to improve a performance of receiving downlinkcontrol information in providing devices and methods of acquiringdownlink control information, determining an uplink signal based onthis, and then measuring a location of a terminal.

Technical Solution

In accordance with at least one aspect of the present disclosure,embodiments described herein relate to a device for measuring locationinformation of a terminal, the device comprising one or more downlinksignal receivers, one or more uplink signal receivers, and a controllerfor controlling the one or more downlink signal receivers and the one ormore uplink signal receivers, wherein the controller configures uplinkresource assignment information based on control information received bythe one or more downlink signal receivers and determines whether anuplink signal is received based on the uplink resource allocationinformation. In order to improve a performance of the device forreceiving the downlink control information, a base station transmits thecontrol information using a modulation and coding scheme (MCS) definedin advance.

Further, this predefined MCS information can be shared, in advance, withdevices measuring a signal from a target terminal according to at leastone aspect of the present disclosure, leading the devices to collectinformation easily. That is, instead of transmitting a signalconsidering a channel condition of the target terminal for all or a partof control information to be transmitted to a target terminal whoselocation is required to be measured, the base station can transmit asignal so that the signal measurement device of the present disclosurecan easily receive the signal. This method can also be applied tocontrol information transmitted over a PDSCH, as well as controlinformation transmitted over a PDCCH in a mobile communication system.

Effects of the Invention

In accordance with various embodiments, a performance of a device forreceiving downlink control information, which collects the presence orabsence of a terminal and location information of the terminal can beimproved while not affecting existing communication networks. Further,the complexity of devices of measuring signals from neighboringterminals can be decreased.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 illustrates a configuration of a signal measurement deviceaccording to one aspect of the present disclosure.

FIG. 2 illustrates a configuration of a signal measurement deviceaccording to another aspect of the present disclosure.

FIG. 3 illustrates a conception of location measurement according to oneaspect of the present disclosure.

FIG. 4 illustrates a configuration of a base station according to oneaspect of the present disclosure.

FIG. 5 is a flow chart to show a determination of a configuration fortransmitting control information for a terminal according to one aspectof the present disclosure.

FIG. 6 is a flow chart to show a determination of a configuration fortransmitting control information for a terminal according to anotheraspect of the present disclosure.

FIG. 7 is a flow chart to show an operation procedure of a signalmeasurement device according to one aspect of the present disclosure.

FIG. 8 is a flow chart to show a procedure of detecting the presence orabsence of an uplink signal by a signal measurement device according toone aspect of the present disclosure.

FIG. 9 is a flow chart to show operation of a terminal according to oneaspect of the present disclosure.

FIG. 10 is a flow chart to show operation of a base station according toone aspect of the present disclosure.

FIG. 11 is a flow chart to show a method for uplink resource assignmentand power control of a base station according to one aspect of thepresent disclosure.

FIG. 12 is a block diagram illustrating a configuration of a locationmeasurement server according to one aspect of the present disclosure.

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, other aspects of the present disclosure will be describedin detail with reference to the accompanying drawings. In addingreference numerals to elements in each drawing, the same elements willbe designated by the same reference numerals, if possible, although theyare shown in different drawings. Further, in the following descriptionof the present disclosure, detailed discussions on known functions andconfigurations incorporated herein may be omitted when it is needed tofocus on the subject matter of the present disclosure.

In the present disclosure, a wireless communication system denotes asystem for providing various communication services such as a voicecommunication service, a packet data service, etc. The wirelesscommunication system includes a terminal (includes a user device or auser equipment (UE)) and a base station (BS).

The terminal is a generic term referring to devices used in wirelesscommunication. For example, the terminal may be referred to, but notlimited to, a UE supporting wideband code division multiple access(WCDMA), long term evolution (LTE), high speed packet access (HSPA),international mobile telecommunications (IMT)-2020 (5G or new radio), orthe like, a mobile station (MS) supporting the global system for mobilecommunication (GSM), a user terminal (UT), a subscriber station (SS), awireless device, or the like.

The base station or a cell generally denote a station communicating withthe terminal. The base station or cell is a generic term referring to,but not limited to, all of various communication service areas anddevices, such as a Node-B, an evolved Node-B (eNB), a gNode-B (gNB), alow power node (LPN), a sector, a site, various types of antennas, abase transceiver system (BTS), an access point, a point (e.g., atransmitting point, a receiving point, or a transceiving point), a relaynode, a megacell, a macrocell, a microcell, a picocell, a femtocell, aremote radio head (RRH), a radio unit (RU), and a small cell.

Each of these various cells is controlled by a base station. Therefore,the base station may be classified into two types. 1) One type of thebase station may denote an apparatus providing a megacell, a macrocell,a microcell, a picocell, a femtocell, or a small cell that forms acommunication service area, and 2) the other type of the base stationmay denote the communication service area. Apparatuses that form andprovide a certain radio area, and that are controlled by one or moreidentical entities or that interact with one another for enabling two ormore entities to cooperate with one another to provide the radio areamay be referred to as the type 1) base station. According to a scheme offorming and providing a communication service area, a point, atransmission/reception point, a transmission point, a reception point,or the like is an example of this type of base station. A communicationservice area itself to which a terminal or a neighboring base stationtransmits a signal or from which the terminal or the neighboring basestation receives a signal may be denoted as the type 2) base station.

In the present disclosure, the cell may denote a coverage of a signaltransmitted from a transmission/reception point, a component carrierhaving a coverage of a signal transmitted from a transmission point or atransmission/reception point, or a transmission/reception point itself.

The terminal and the base station herein are entities for performing twotypes of transmissions or receptions (uplink and downlink) used toembody embodiments, examples, technologies, or technical ideas describedin the present disclosure. Thus, the terminal and the base stationherein include all entities capable of performing such operations andare not limited to specific terms or words.

Herein, the uplink (hereinafter, referred to as “UL”) refers to datatransmission/reception by a UE to/from a base station, and the downlink(hereinafter, referred to as “DL”) refers to data transmission/receptionby a base station to/from a UE.

An uplink transmission and a downlink transmission may be performedusing a time division duplex (TDD) technique in which a transmission canbe performed at a time different from another transmission, a frequencydivision duplex (FDD) technique in which a transmission can be performedat a frequency different from another transmission, or a hybridtechnique of the frequency division duplex (FDD) and the time divisionduplex (TDD).

Further, in a standard for a wireless communication system, uplink anddownlink are configured based on a single carrier or a pair of carriers.

Control information is transmitted in the uplink and/or the downlinkconfigured with a control channel, such as a physical downlink controlchannel (PDCCH), a physical uplink control channel (PUCCH), and thelike, and Data are transmitted in the uplink and/or the downlinkconfigured with a data channel, such as a physical downlink sharedchannel (PDSCH), a physical uplink shared channel (PUSCH), and the like.

The downlink may denote communication or a communication path frommultiple transmission/reception points to a terminal, and the uplink maydenote communication or a communication path from the terminal to themultiple transmission/reception points. In the downlink, a transmittermay be a part of multiple transmission/reception points, and a receivermay be a part of a terminal. In the uplink, a transmitter may be a partof a terminal and a receiver may be a part of multipletransmission/reception points.

Hereinafter, a situation where a signal is transmitted or receivedthrough a channel such as the PUCCH, the PUSCH, the PDCCH, or the PDSCH,may be expressed as the transmission or reception of the PUCCH, thePUSCH, the PDCCH, or the PDSCH.

Meanwhile, higher layer signaling herein includes radio resource control(RRC) signaling transmitting RRC information containing an RRCparameter.

A base station performs a downlink transmission to terminals. The basestation may transmit a physical downlink control channel fortransmitting i) downlink control information, such as schedulingrequired to receive a downlink data channel that is a primary physicalchannel for a unicast transmission, and ii) scheduling approvalinformation for a transmission through an uplink data channel.Hereinafter, transmitting/receiving a signal through each channel may bedescribed in such a manner that a corresponding channel istransmitted/received. A base station can transmit resource assignmentinformation to a terminal through a PDCCH, Further, the base station cantransmit a control signal for resource assignment and signaltransmission to the terminal through a PDSCH as well.

Any of multiple access techniques applied to wireless communicationsystems may be applicable to a wireless communication system of thepresent disclosure. For example, the wireless communication system mayemploy various multiple access techniques, such as time divisionmultiple access (TDMA), frequency division multiple access (FDMA), CDMA,orthogonal frequency division multiple access (OFDMA), non-orthogonalmultiple access (NOMA), OFDM-TDMA, OFDM-FDMA, OFDM-CDMA, or the like.The NOMA includes sparse code multiple access (SCMA), low cost spreading(LDS), and the like.

Embodiments or examples described in the present disclosure may beapplicable to resource assignment in both an asynchronous wirelesscommunication evolving into LTE/LTE-advanced and IMT-2020 from GSM,WCDMA, and HSPA, and a synchronous wireless communication evolving intocode division multiple access, CDMA-2000, and UMB.

In the present disclosure, a machine type communication (MTC) terminalmay denote a terminal supporting low costs (or low complexity), aterminal supporting coverage enhancement, or the like. As anotherexample, the MTC terminal may denote a terminal defined as apredetermined category for supporting low cost (or low complexity)and/or coverage enhancement.

In other words, the MTC terminal herein may denote a low cost (or lowcomplexity) user equipment category/type newly defined in 3GPPRelease-13 and performing LTE-based MTC-related operations. The MTCterminal may denote a user equipment category/type defined in or before3GPP Release-12, which supports enhanced coverage in comparison with thetypical LTE coverage or supports low power consumption. The MTC terminalmay also denote a low cost (or low complexity) user equipmentcategory/type newly defined in Release-13. The MTC terminal may denote afurther enhanced MTC terminal defined in Release-14.

In the present disclosure, a NarrowBand Internet of Things (NB-IoT)terminal denotes a terminal supporting radio access for cellular IoT.NB-IoT technology has been developed to provide improved indoorcoverage, support for large-scale low-speed terminals, low latencysensitivity, very low terminal costs, low power consumption, andoptimized network architecture.

An enhanced mobile broadband (eMBB), massive machine-type communication(mMTC), and ultra-reliable and low latency communication (URLLC) areproposed as representative usage scenarios for NR having been discussedin the 3GPP recently.

In the present disclosure, a frequency, a frame, a subframe, a resource,a resource block (RB), a region, a band, a sub-band, a control channel,a data channel, a synchronization signal, various reference signals,various signals, and various messages, associated with NR may beinterpreted as meanings that were used in the past or are used in thepresent or as various meanings that will be used in the future.

A signal measurement device according to embodiments of the presentdisclosure may be mainly used for measuring a signal from a targetterminal, and based on this, measuring a location of the targetterminal. A device of performing such a function may be referred to asthe signal measurement device, a location measurement device, a positionfinder, and the like, and thus, these devices may be referred to asdevices having substantial equal or similar functionality.

In accordance with one aspect of the present disclosure, methods andapparatuses are provided for acquiring information on a location of aterminal in a wireless communication system, particularly a mobilecommunication system.

In accordance with one aspect of the present disclosure, a communicationdevice with a new configuration is proposed in which both a downlinksignal receiver and an uplink signal receiver are included. Thisproposed communication device may include one or more uplink signalreceivers, and in this case, each uplink signal receiver may beinstalled in a physical location different from one another.

The communication device can acquire information on one or more signalsthat may be transmitted from a terminal to a base station through uplinkby analyzing a downlink signal transmitted by the base station. Further,the communication device can determine whether data of the uplink aretransmitted from the terminal to the base station through one or moreuplink receivers, and identify a location of the terminal.

Embodiments or examples of the present disclosure are related to atechnology for acquiring location information of terminals in thewireless communication system.

Devices and methods in which embodiments of the present disclosure areapplicable may be used for services of providing accurate locationinformation of a terminal using a mobile communication system, as wellas services of providing traffic information and public services throughthe wireless communication system.

Embodiments and examples of the present disclosure are expected to beapplied in various fields, such as a service of providing a location ofa terminal, road control, traffic control, a location informationservice, and security.

A related technology that is closely associated with the embodiments orexamples of the present disclosure is mobile communication systems.

Hereinafter, embodiments of the present disclosure will be discussed indetail with reference to accompanying drawings. Further, in describingembodiments of the present disclosure, detailed discussions on knownfunctions and configurations incorporated herein may be omitted when itis needed to focus on the subject matter of the present disclosure. Theterms described below are terms defined considering embodiments,examples, and technical ideas in the present disclosure, and may bedifferently expressed according to intentions or customs of a user, anoperator, or the like. Thus, such definition should be interpreted basedon the context of the present disclosure

Meanwhile, each of embodiments or examples described below may beapplicable individually or in any combination with one or more otherembodiments or examples.

FIG. 1 illustrates a configuration of a signal measurement deviceaccording to one aspect of the present disclosure. The signalmeasurement device shown in FIG. 1 can receive uplink resourceassignment information transmitted through a wireless communicationsystem, determine whether a terminal transmitting a signal on thecorresponding resource based on the uplink resource assignmentinformation is present, and acquire information on a location of theterminal based on information related to the signal, such as anintensity of the signal. Discussions on the signal measurement deviceshown in FIG. 1 are conducted based on a scenario in which uplinkresource assignment information is acquired via at least one downlinksignal receiver.

Referring to FIG. 1 , the signal measurement device according to oneaspect of the present disclosure may include a downlink signal receiver110, an uplink signal receiver 120, and an antenna 140. Thus, the signalmeasurement device according to one aspect of the present disclosure canreceive both an unlike signal and a downlink signal, unlike a normalmobile communication terminal or a base station.

In the structure of FIG. 1 , uplink and downlink signals can be receivedvia a single antenna. Further, the signal measurement device can enablea controller 130 to control the uplink signal receiver 120 and thedownlink signal receiver 110 to interoperate with each other. However,embodiments of the present disclosure are not limited thereto. Forexample, in the structure of FIG. 1 , when needed, an uplink antenna anda downlink antenna, which are separated from each other. may beemployed, and multiple uplink antennas and multiple uplink receivers maybe employed.

FIG. 2 illustrates a configuration of a signal measurement deviceaccording to another aspect of the present disclosure.

Referring to FIG. 2 , the signal measurement device includes one or moredownlink signal receivers 210 and one or more uplink signal receivers220 to receive a signal in a mobile communication network. Further, thesignal measurement device includes a controller 230 for controlling thereceived signal. Specifically, one or more downlink signal receivers 210can receive a downlink signal; the controller 230 can acquire controlinformation for a target terminal based on the downlink signal; and oneor more uplink signal receivers 220 can receive an uplink signal fromthe target terminal based on the control information on the targetterminal. Further, the controller 230 can determine a location of thetarget terminal based on the uplink signal received from the targetterminal. Optionally, the signal measurement device may include acommunication unit 240 for performing communication with a base station,a location measurement server, or one or more other signal measurementdevices, a GPS receiver 270 for performing synchronization with anabsolute time, an input unit 250 for receiving an input from a user, andan output unit 260, such as a display, outputting information processedby the controller 230.

Here, the downlink signal receiver 210 and the uplink signal receiver220 may be an LTE downlink signal receiver and an LTE uplink signalreceiver, respectively. The operation of one or more signal measurementdevices of the present disclose for performing communication isdiscussed based on the LTE system; however, it should be noted that thedevices may be easily applicable to other wireless communicationsystems, such as 5G, GSM, W-CDMA, and the like. That is, if acommunication system in which a call of a target terminal is establishedis the GSM or W-CDMA system, the downlink signal receiver 210 and theuplink signal receiver 220 are implemented as a downlink signal receiverand an uplink signal receiver of GSM or W-CDMA system, respectively.

The downlink signal receiver 210 serves to acquire time synchronizationto the LTE system by capturing a downlink signal from the system in aninitial stage, and acquire an ID of an associated base station, systeminformation, and the like. Further, the downlink signal receiver 210 canreceive control information transmitted by the base station to a targetterminal. The uplink signal receiver 220 serves to detect a transmissionsignal from a target terminal based on information on an uplinktransmission resource assigned to the target terminal, and calculate anarrival time of the signal, signal power, and the like.

The signal measurement device of the present disclosure is required tohave a capability of acquiring an absolute time reference, andcalculating a difference in time points at which respective signalmeasurement devices receive an uplink signal from the target terminal.In the embodiment of FIG. 2 , to do this, one or more signal measurementdevices can acquire time synchronization based on a GPS signal receivedby the GPS receiver 770. However, embodiments of the present disclosureare not limited thereto. For example, time synchronization may beacquired between different types of signal measurement devices, or anymethod capable of identifying a difference in time points at which anuplink or downlink signal arrives may be used. For example, timesynchronization may be implemented by setting a time in advance betweensignal measurement devices using a high-precision clock, or by anymethod or technique capable of calculating a relative difference intime. Further, location measurement may be performed by time informationbased on a time difference between a time point at which a specificsignal is received by the LTE downlink signal receiver and a time pointat which an uplink signal from another user is received. Information onsuch reception times may be transmitted to a location measurementserver. The location measurement server can determine a location of atarget terminal based on the measurement results of one or more signalmeasurement devices. The location measurement server of the presentdisclosure can determine a location of a target terminal based onmeasurement results for a signal from the target terminal which areperformed by one or more signal measurement devices, and to do this, canuse various measurement results, such as propagation delay, propagationattenuation, a reception direction of a signal, and the like.

In some embodiments, the signal measurement device of the presentdisclosure may use the communication unit 240 as a separatecommunication unit for directly communicating with a locationmeasurement server or a base station, or for directly communicating oneor more other signal measurement devices. Since the communication unit240 is connected to the base station or the location measurement server,the signal measurement device can provide information to, or receiveinformation from, the base station or the location measurement server.Specifically, to perform location measurement for a target terminal, thecommunication unit 240 can transmit, to a base station, a signalrequesting control information for the target terminal.

In one embodiment, the communication unit 240 of the signal measurementdevice may transmit channel state information of the signal measurementdevice to the base station. According to this, the base station cantransmit control information for the terminal considering the channelstate information of the signal measurement device, as well as channelstate information of the terminal.

The signal measurement device of FIG. 2 includes an output unit 260 suchas a display for providing a location of the target terminal to a user.Further, the location measurement device includes the input unit 250 forreceiving an input from a user. It is therefore possible to increase theaccuracy of location measurement by allowing the user to manually inputadditional information such as information on a current position of thelocation measurement device through the input unit 250. Further, thesignal measurement device includes the controller 230 for controllingthe operation of the signal measurement device. The controller 230 isconnected to associated devices, units, or components, and serve tocontrol information reception, measurement, communication, input andoutput, and the like needed to perform embodiments of the presentdisclosure.

FIG. 3 illustrates a conception of location measurement according to oneaspect of the present disclosure.

Referring to FIG. 3 , one or more signal measurement devices may beplaced in the vicinity of a target terminal whose location is requiredto be measured. The signal measurement devices receive a signaltransmitted by the target terminal, measure information of an intensityof the received signal, an arrival time delay, and the like, anddetermine a location of the target terminal based on the measuredinformation. In one method, the determination of the location of thetarget terminal can be performed such that the signal measurementdevices transmit information obtained by measuring the signaltransmitted by the target terminal to a location measurement server, andthen the location measurement server can calculate a location of thetarget terminal. Information on the calculated location of the targetterminal may be transmitted to each signal measurement device. Further,in another method, the signal measurement devices can share measurementresults obtained by measuring the signal transmitted by the targetterminal with one another, and then each signal measurement device canmeasure or determine a location of the target terminal. In the aboveprocess, a base station can perform communication with the targetterminal by establishing a link with the target terminal, and transmit,to the target terminal, uplink resource assignment information so thatthe target terminal can transmit an uplink signal. The one or moresignal measurement devices may be devices similar to the signalmeasurement device of FIG. 1 or 2 , and it should be noted thatconfigurations and/or discussions related to the signal measurementdevice of FIG. 1 or 2 may be substantially equally applicable to thesignal measurement device of FIG. 3 . The embodiment as shown in FIG. 3may be variously used for measuring a location of a target terminal.

The signal measurement device according to embodiments of the presentdisclose can measure a signal transmitted by a target terminal, andbased on this, acquire information on the presence or absence of thetarget terminal, location information, a distance from the signalmeasurement device, and the like. In this process, the signalmeasurement device can measure information of an intensity of a signaltransmitted by the target terminal, a time delay, and the like.

The signal measurement device of FIG. 1 or 2 can acquire uplink resourceassignment information by receiving a downlink signal in the mobilecommunication system. Specifically, the signal measurement device of thepresent disclosure can determine which control information may betransmitted from a base station to a terminal by receiving a forwardsignal, i.e. a downlink signal. In particular, by receiving controlinformation connected with a radio network temporary identifier (RNTI)via a downlink signal receiver, the device of the present disclosure candetermine whether an uplink signal may be transmitted, that is, whetherthe terminal may transmit the uplink signal to the base station based onthe control information thereafter.

The term “RNTI” is used as a temporary ID of a terminal in a basestation, and since information on which RNTI is assigned to a terminalis not provided, its anonymity can be maintained. Herein, the RNTI isemployed for the purposed of identifying a terminal; however,embodiments of the present disclosure are not limited thereto. Herein,it should be noted that any ID temporarily assigned to a terminal in onebase station or cell may be used for the same purpose or function as theRNTI.

That is, instead of measuring location information for any terminal, thedevice of the present disclosure can receive control informationconnected with a specific RNTI for measuring location information ofonly a terminal identified with the specific RNTI. When the RNTI is usedas identification information of a terminal, there is an advantage thatcan specify a terminal whose location information is required to bemeasured at a specific time without leaking personal information of auser (e.g. a phone number, a name, a serial number).

In embodiments of the present disclosure, there are provided methods ofacquiring information of a terminal including the presence or absence ofthe terminal, a distance from one or more signal measurement devices, alocation of the terminal, and the like based on the RNTI information. Inthe present disclosure, it is necessary to perform reception anddemodulation for a downlink channel in order to receive controlinformation including uplink resource assignment transmitted ondownlink. In the present disclosure, methods of receiving downlinkcontrol information are discussed.

In one embodiment of the present disclosure, a base station can signalRNTI information of a target terminal to one or more signal measurementdevices in advance, and based on this, collect the presence or absenceof the target terminal or location information of the target terminal.For example, in the embodiment of FIG. 3 , a base station cancommunicate with a communication unit of a signal measurement device,and provide RNTI information of a target terminal to the signalmeasurement device. In another embodiment, a mobile communication basestation and one or more signal measurement devices of the presentdisclosure can define, in advance, an RNTI of a terminal to transmit anuplink signal. That is, an RNTI to be used may be defined in advance,and then, the terminal may be allowed to transmit an uplink signal usingthe predefined RNTI. Further, downlink control information may betransmitted based on the RNTI. However, it should be noted thatconfigurations and discussions of the present disclosure may besubstantially equally applicable in even a situation in which a signalmeasurement device does not know an RNTI of a target terminal or desiresto acquire location information on unspecified terminals.

In the present disclosure, a base station or a mobile communicationsystem can establish a communication line with a target terminal so thatthe target terminal can transmit an uplink signal. To do this, the basestation may transmit uplink resource assignment information throughdownlink to the target terminal periodically or aperiodically.

In this process, the signal measurement device of the present disclosurecan receive the resource assignment information transmitted by the basestation to the target terminal, and based on this, measure a signaltransmitted by the target terminal. That is, the signal measurementdevice of the present disclosure can acquire uplink resource assignmentinformation by receiving downlink of an associated mobile communicationsystem. Here, the resource assignment information received by the signalmeasurement device is resource assignment information for any terminal,that is, information transmitted to the terminal. Since such resourceassignment information is transmitted using a modulation and codingscheme and power optimized for a target terminal, there is therefore aprobability that the signal measurement device may not properly receivethe resource assignment information. That is, the resource assignmentinformation is transmitted to the target terminal, and therefore, thesignal measurement device of the present disclosure may not beguaranteed to properly receive the resource assignment informationtransmitted to the target terminal. In case the signal measurementdevice does not properly receive the resource assignment information,the signal measurement device may not normally operate. In the presentdisclosure, taking account of such a situation, there is provided amethod for accurately identifying the presence or absence, or alocation, of a target terminal by improving a downlink receptionperformance of the signal measurement device. In the present disclosure,to improve a performance of a signal measurement device for receivingcontrol information transmitted to a target terminal, there is provideda method of allowing a base station to transmit control informationusing a format defined in advance between the base station and one ormore signal measurement devices of the present disclosure. In case of anormal communication, such a format may be defined in advance, forexample, through an agreement or arrangement, between a base station anda target terminal having an established communication link with the basestation. However, in the present disclosure, to improve a receptionperformance of the signal measurement device of the present disclosure,not a reception performance of a target terminal, there is proposed amethod of transmitting resource assignment information using a formatdefined in advance between a base station and the device of the presentdisclosure.

FIG. 4 is a block diagram illustrating a configuration of a base stationaccording to one aspect of the present disclosure.

Referring to FIG. 4 , the base station of the present disclosureincludes a terminal information determination unit 410 determiningwhether a terminal is a target terminal whose location is required to bemeasured, and a transmission configuration determination unit 420determining a configuration for transmitting control information for theterminal based on a result of the determination.

Specifically, the terminal information determination unit 410 of thebase station of the present disclosure can determine whether a terminalis a target terminal whose location is required to be measured, or anormal terminal whose location is not required to be measured.

In one embodiment, the terminal information determination unit 410 candetermine whether a terminal is a target terminal whose location isrequired to be measured, or a normal terminal whose location is notrequired to be measured based on a request signal received from a signalmeasurement device measuring a location of the terminal.

In another embodiment, when a request signal is received from aterminal, the terminal information determination unit 410 can determinethat the terminal is a terminal whose location is required to bemeasured. That is, to allow a location of the terminal to be measuredaccurately, the terminal itself may be a target terminal by requestingan associated mobile communication system to measure its own locationaccurately.

In another embodiment, the terminal information determination unit 410can determine whether a terminal is a target terminal whose location isrequired to be measured, or a normal terminal whose location is notrequired to be measured based on a request signal received from anexternal server. For example, the external server may be a server for anemergency rescue.

Further, the transmission configuration determination unit 420 of thebase station of the present disclosure can determine a configuration fortransmitting control information for a terminal based on a result of thedetermination of the terminal information determination unit 410. Whenthe terminal is a terminal whose location is required to be measured, abase station can determine a configuration for transmitting controlinformation for the terminal considering a state of a signal measurementdevice measuring a location of the terminal, such as a location, achannel state, and the like, as well as a state of the terminal. Incontrast, when the terminal is a normal terminal whose location is notrequired to be measured, the base station can determine to transmitcontrol information for the terminal considering only a state of theterminal.

Specifically, when the terminal is determined as a target terminal, thetransmission configuration determination unit 420 can determine at leastone of a control channel element (CCE) aggregation level fortransmitting control information for the terminal, a modulation andcoding scheme (MCS), the amount of resources, the number of bits oftransmission data, the minimum number of times that HARQ transmission isrequired to be performed, transmission power, and a scramblingconfiguration for a PDCCH.

In one embodiment, when the terminal is determined as a target terminal,the transmission configuration determination unit 420 can determine aCCE aggregation level based on a CCE aggregation level considering aminimum CCE aggregation level and a channel state of the terminal.

In the case of the LTE system, information related to resourceassignment may be transmitted through a PDCCH of downlink. The PDCCH maybe transmitted by being configured with any of CCE aggregation levels 1,2, 4, and 8 according to a state of a terminal. When the PDCCH istransmitted by being configured with a high CCE aggregation level, thePDCCH may be easily received even when a channel state is not good, butin this case, a lot of resources and transmission power are required. Onthe other hand, when the PDCCH is transmitted by being configured with alow CCE aggregation level, which corresponds to a situation where aterminal is placed in the vicinity of a base station, while a signal canbe transmitted using a small resource, it is not easy to receive thesignal when a channel state is poor.

Such a change of the CCE aggregation level is determined considering achannel state of a target terminal according to embodiments of thepresent disclosure. In the present disclosure, there is proposed amethod of determining a corresponding CCE aggregation level consideringa reception performance of an information reception device, such as asignal measurement device, according to embodiments of the presentdisclosure.

To do this, various configuration methods may be available. In oneexample, when it is not easy to identify accurately where a signalmeasurement device of the present disclosure is placed, or when thedevice of the present disclosure has great mobility, a PDCCH can betransmitted by being configured with a highest CCE aggregation level. Inanother example, a minimum CCE aggregation level may be determined.Further, minimum transmission power needed to transmit a PDCCH may bedetermined in advance.

That is, when a base station transmits a PDCCH to a target terminalwhose location is required to be measured, the base station can transmitthe PDCCH using a modified CCE aggregation level, instead of using a CCEaggregation level required to be used considering a channel state of thetarget terminal in a normal situation. The modified CCE aggregationlevel may be determined as follows.

A modified CCE aggregation level=max (a minimum CCE aggregation level, aCCE aggregation level considering a channel state of a target terminal)

FIG. 5 is a flow chart to describe the operation of a base stationconfiguring a CCE aggregation level for a PDCCH.

At an initial stage, the base station determines that a PDCCHtransmission is required, at step S510. Thereafter, the base stationdetermines whether a terminal to which the PDCCH is transmitted is atarget terminal, at step S520. Here, the base station may receive arequest signal from the terminal, a signal measurement device measuringa location of the terminal, or an external server, and based on thereceived request signal, determine whether the terminal is the targetterminal whose location is required to be measured. When it isdetermined that the terminal is the target terminal whose location isrequired to be measured, the base station can determine a CCEaggregation level based on a CCE aggregation level considering a minimumCCE aggregation level and a channel state of the terminal, at step S530.In one embodiment, the determined CCE aggregation level may be a max (aminimum CCE aggregation level, a CCE aggregation level considering achannel state of the target terminal). On the other hand, when it isdetermined that the terminal is a normal terminal whose location is notrequired to be measured, the base station can determine a CCEaggregation level considering a channel state of the terminal.

Such a determination of the CCE aggregation level may be performed bybeing defined in advance between the base station and one or more signalmeasurement devices of the present disclosure. In this case, the deviceof the present disclosure does not need to search a PDCCH transmitted bybeing configured with a level less than or equal to the minimum CCEaggregation level; thus, the complexity of the device may be reduced.That is, PDCCH search may be performed for a limited search space.

In another embodiment, when it is determined that the terminal is thetarget terminal, the transmission configuration determination unit 420can determine to transmit control information for the terminal usingtransmission power greater than first transmission power. Here, thefirst transmission power indicates an amount of transmission power thatthe signal can reach a location of the terminal, and the transmission ofthe control information for the terminal by the transmissionconfiguration determination unit 420 using the transmission powergreater than the first transmission power denotes that the controlinformation is transmitted using an amount of power enabling aninformation collection device, such as a signal measurement device,located farther than the terminal to receive a signal. For example, thebase station can transmit a signal using maximum transmission powerenabling a signal to reach a farthest location of the coverage of thebase station.

The transmission or reception power of the PDCCH may be configured to besimilar to that of such reception or transmission. Through such aconfiguration, one or more signal measurement devices according toembodiments of the present disclosure, as well as a target terminal, canstably receive the PDCCH transmitted by the base station to the targetterminal.

In a communication system including one or more base stations, one ormore target terminals whose locations are required to be measured andwhose presence or absence is required to be determined, one or moresignal measurement devices detecting a signal transmitted by the targetterminal, a method of transmitting control information according toembodiments of the present disclosure, in which the base stationtransmits control information to the target terminal, may be performedsuch that the base station determines a format and power of a signal tobe transmitted considering a channel state from the base station to thesignal measurement device, as well as a channel state from the basestation to the target terminal, and then, transmits the controlinformation based on this determination.

In another embodiment, when it is determined that the terminal is thetarget terminal, the transmission configuration determination unit 420can configure scrambling for the PDCCH not to use identifier informationof the terminal.

In the 5G NR, scrambling for a PDCCH may be different from that of theLTE. In the LTE, scrambling for a PDCCH is performed using informationof a cell ID. In the 5G NR, scrambling for the PDCCH may be performedusing RNTI information and an nID that is a parameter of an additionalhigher layer.

The transmission configuration determination unit 420 of the basestation of the present disclosure can configure a function of scramblingusing RNTI information not to be used in the base station so that thesignal measurement device can easily receive a forward PDCCH.

Further, the nID may be configured to be equal to, or in the same manneras, information of a cell ID. The base station can provide informationon this configuration to the signal measurement device of the presentdisclosure. In another method, the base station can define informationon a scrambling method including the nID, and then provide this to thesignal measurement device. In another method, this information may bedefined in advance, and the base station and the signal measurementdevice can operate with the same information.

In another embodiment, when it is determined that the terminal is thetarget terminal, the transmission configuration determination unit 420can determine to transmit a higher layer parameter used for scramblingfor the PDCCH and identifier information of the terminal to the signalmeasurement device. That is, the base station performs scrambling usingthe function of using RNTI information and using nID information, andprovides related information to the device of the present disclosure inadvance. In another embodiment, this information may be defined inadvance, for example, through an agreement, between the base station andthe signal measurement device of the present disclosure. The signalmeasurement device according to embodiments of the present disclosureperforms a reception for the PDCCH based on scrambling information onthe PDCCH.

In LTE system, uplink resource assignment information may be transmittedover the PDSCH, as well as the PDCCH. In this case, downlink resourceassignment information may be transmitted over the PDCCH, andthereafter, uplink resource assignment information and information on atransmission period, and the like may be transmitted over the PDSCH.Generally, the control for uplink transmission performed through thePDSCH may be, for example, a configuration for the PUCCH, periodicsignal transmission through the uplink, semi-persistent scheduling.

When the base station transmits uplink resource assignment for a targetterminal over the PDSCH, since the signal measurement device of thepresent disclosure cannot identify the resource assignment, for example,which type of the resource assignment is transmitted, there is a problemthat the signal measurement device is required to attempt to receive allPDSCHs transmitted to the target terminal. This may cause the complexityof the signal measurement device of the present disclosure to increase.In the present disclosure, when a base station transmits a PDSCH foruplink resource assignment to a target terminal, a data transmissionscheme, such as an available modulation and coding scheme (MCS), theamount of resources, the number of bits of transmission information, atransmission scheme, and the like may be defined in advance. Forexample, the PDSCH may be transmitted using an IMCS, which is an MCSindex, less than or equal to a predetermined number. In one embodiment,an MCS index for transmitting the PDSCH may be limited to between 1 and5. In another embodiment, an MCS index for transmitting the PDSCH may belimited to only 0 or 1. In further another embodiment, an MCS index fortransmitting the PDSCH may be limited to only 0. Further, when one blockis transmitted, the number of bits of control information related touplink resource assignment allowed to be transmitted may be limitedwithin a predetermined number of bits. Further, when control informationis transmitted, the control information may be defined to be transmittedin only a transmission antenna diversity mode.

As discussed above, when a PDSCH transmission is not a predefined PDSCHdata transmission type, the device of the present disclosure may notperform corresponding PDSCH reception. Thus, the demodulation anddecoding of useless PDSCH data may be minimized.

Even when a PDSCH is transmitted using a low MCS index, there is aprobability that any of signal measurement devices of the presentdisclosure may not successfully receive this PDSCH. This is because thePDSCH is repeatedly transmitted through a HARQ process, in case a targetterminal successfully receives it, particularly at an early time, andinforms a base station of this, the base station does not perform anadditional repetition transmission any more. In the present disclosure,in order to improve a probability that a signal measurement devicesuccessfully receives PDSCH information transmitted to a targetterminal, even when the target terminal successfully has decoded this,the base station can additionally perform the HARQ. That is, the minimumnumber of times that HARQ transmission is required to be performed maybe defined in advance, and in this case, even when the target terminaltransmits an ACK, the base station continually performs the HARQoperation until the minimum number of times is reached.

For example, in the LTE system, the HARQ transmission that can beperformed may be limited up to 4 times. When the target terminalsuccessfully receives corresponding data before the HARQ transmissionreaches the 4 times, the target terminal can signal that the data havebeen successfully received by transmitting an ACK to the base station.The base station received the ACK can stop the HARQ transmission of thedata.

FIG. 6 is a flow chart to show operation of a base station fortransmitting control information for resource assignment to a targetterminal through a PDSCH according to one aspect of the presentdisclosure.

In the present disclosure, a signal measurement device, as well as atarget terminal, may be required to receive the data. That is, even whenthe target terminal successfully receives the data, there is aprobability that the signal measurement device according to embodimentsof the present disclosure may not receive the data. In the presentdisclosure, in order to enable the signal measurement device as well asa target terminal to receive the data, even when the target terminaltransmits an ACK, there is provided a method of performing HARQtransmission greater than or equal to a predetermined number of times byignoring the ACK from the target terminal.

At an initial stage, the base station determines to perform uplinkresource assignment to a target terminal through a PDSCH, at step S610.Thereafter, the base station determines whether a terminal to which thePDSCH is transmitted is the target terminal, at step S620. Here, thebase station can receive a request signal from the terminal, a signalmeasurement device measuring a location of the terminal, or an externalserver, and based on the received request signal, determine whether theterminal is the target terminal whose location is required to bemeasured.

When it is determined that the terminal is the target terminal, the basestation can signal, through a PDCCH, that the PDSCH is transmitted usingan MCS and a transmission format defined in advance, at step S630.Further, the base station can perform the PDSCH transmission using thepredefined MCS and transmission format, at step S640. The base stationcan perform HARQ retransmission greater than or equal to a minimumnumber of times that transmission is required to be performed, at stepS650.

For example, in the LTE system, HARQ transmission may be performed up to4 times, which is the maximum number of times that the HARQ transmissioncan be performed regardless of an ACK/NACK transmission from a targetterminal. This number of times may be provided in advance to the signalmeasurement device according to embodiments of the present disclosure.Further, the HARQ transmission can be performed through a pre-configuredresource, and thus, even when at least a part of the PDCCH is notreceived, the HARQ of the corresponding PDSCH can be received.

According to embodiments of the present disclosure, when the basestation transmits a PDSCH channel, which is a data channel, the basestation can determine whether a terminal to which the PDSCH channel isto be transmitted is a normal terminal or a target terminal whoselocation is required to be measured, and when it is determined that theterminal is the target terminal, transmit the PDSCH channel using atransmission format (including MCS and scrambling), a scheme, power, andthe like different from those transmitted for the normal terminal.Accordingly, the signal measurement device of the present disclosure canmore stably receive the information of this channel.

According to embodiments of the present disclosure, the base station canprovide RNTI information used by the target terminal to the signalmeasurement device in advance. At the same time, the base station canprovide information on the transmission schemes of control channel anddata channel transmitted in forward link to the signal measurementdevice. This may include CCE aggregation level information on the PDCCHof the LTE system. Further, when control information is transmitted overthe PDSCH, the information may include information on a transmissionformat including MCS information used in the PDSCH. Further, when HARQoperation for the PDSCH is performed, information on the number of timesthat the HARQ transmission is required to be minimally performed may beprovided to the signal measurement device according to embodiments ofthe present disclosure. Further, without providing such information tothe signal measurement device, the information may be defined in advancebetween the base station and the signal measurement device, andthereafter, a signal may be transmitted or received using thisinformation.

on the other hand, when it is determined that the terminal is a normalterminal whose location is not required to be measured, the base stationcan perform corresponding PDSCH transmission using a MCS and atransmission format considering a channel state of the terminal. At thistime, the base station performs normal HARQ transmission, at step S670.

In one embodiment, the base station may further include a communicationunit communicating with one or more signal measurement devices measuringa location of a terminal. The communication unit can receive channelstate information of the signal measurement device from the signalmeasurement device, and the transmission configuration determinationunit can determine a configuration for transmitting control informationfor the terminal based on a result of the determination of the terminalinformation determination unit and the channel state information of thesignal measurement device. Specifically, the signal measurement deviceof the present disclosure may periodically, or aperiodically, provide astate of a forward channel to a mobile communication system or a basestation. Further, based on this, the base station may change informationon transmission schemes of the control channel and the data channel, andadditionally provide this to the signal measurement device of thepresent disclosure. Like this, information on a scheme for transmittingcontrol information to a target terminal may be changed depending on achannel state of the signal measurement device.

In one embodiment, the base station may further include a communicationunit communicating with one or more signal measurement devices measuringa location of a terminal. Specifically, the communication unit maytransmit, to the signal measurement device, at least one of a CCEaggregation level, an MCS, the amount of resources, the number of bitesof transmission data, the minimum number of times that HARQ transmissionis required to be performed, transmission power, and a scramblingconfiguration for a PDCCH.

Further, in a communication system including one or more base stations,one or more target terminals whose locations are required to be measuredand whose presence or absence is required to be determined, one or moresignal measurement devices detecting a signal transmitted by the targetterminal according to embodiments of the present disclosure, the signalmeasurement device can define information on a transmission format fortransmitting control information to the target terminal in advance withthe base station, and thereafter, considering the predefinedtransmission format, receive control information transmitted to thetarget terminal on downlink.

Specifically, the base station can share at least one of a CCEaggregation level, an MCS, the amount of resources, the number of bitesof transmission data, the minimum number of times that HARQ transmissionis required to be performed, transmission power, and a scramblingconfiguration for a PDCCH in advance with the signal measurement device.That is, information on transmission schemes of the control channel andthe data channel may be defined in advance between the base station andthe signal measurement device of the present disclosure, and thepredefined transmission schemes may be operated without providing thisthrough a specific communication.

Based on this information, the signal measurement device of the presentdisclosure can receive control information transmitted to a targetterminal on downlink of an associated mobile communication system. Whenthe control information is transmitted over the PDCCH, the signalmeasurement device may search only a search space satisfying a conditionof a pre-inputted CCE aggregation level among search spaces of thePDCCH. Further, even when all search spaces are searched, one or moresearch spaces that have a level different from a predefined CCEaggregation level may be determined not to be a normal PDCCH, and thusignored.

Further, when control information is transmitted over a PDSCH of anassociated mobile communication system, downlink resource assignmentinformation may be transmitted over a PDCCH first. When the PDCCH isreceived, the signal measurement device can check whether a transmissionformat of the PDSCH transmitted thereafter is equal to informationinputted in advance, and when it satisfies a condition of thepre-inputted information, perform the demodulation and decoding of thePDSCH. Further, in even a reception process of the PDSCH, consideringinformation on HARQ repetition times inputted in advance, an HARQcombination of a signal to be transmitted can be performed.

Based on this, the signal measurement device can acquire information onwhen an uplink signal may be transmitted and which resource the uplinksignal may be transmitted over. The signal measurement device canattempt to receive an uplink signal transmitted by a terminal to a basestation based on uplink resource assignment information acquired throughsuch operation, and determine whether the uplink signal is transmittedbased on a result obtained by attempting to receive the uplink signal.In this case, this determination may be performed by a controller of thesignal measurement device.

When the base station of the present disclosure is used, the complexityof the signal measurement device receiving control information can bereduced, and a performance of the signal measurement device forreceiving the control information transmitted to a target terminal canbe improved.

If for a time period at which, or a frequency resource on which, it isindicated that an uplink signal is to be transmitted in controlinformation, the transmission of data for the uplink signal from aterminal to a base station is detected through an uplink signal receiverof the signal measurement device, the signal measurement device maydetermine that the terminal whose location is required to be measured isplaced at a location in the vicinity of the uplink signal receiver.Further, based on this, the signal measurement device can acquireinformation on the terminal including the presence or absence of theterminal, a location of the terminal, and the mobility of the terminal.

FIG. 7 is a flow chart to show an operation procedure of a signalmeasurement device according to one aspect of the present disclosure.

In FIG. 7 , the operation of the device is discussed based on the LTEsystem as one example of mobile communication systems. The LTE systemoperates based on a TTI of 1 ms, and forward control information may betransmitted from a base station to a terminal in each transmission timeinterval (TTI). Meanwhile, the procedure discussed below may be equallyapplicable to even any mobile communication systems other than the LTEsystem.

The signal measurement device can receive control informationtransmitted from a base station to a terminal, at step S710.

The terminal can demodulate and decode one or more downlink signals ineach TTI. At this time, the downlink signal received by the terminalfrom the base station may be a control channel such as a PDCCH or a datachannel such as a PDSCH. That is, in the LTE, control information may benormally transmitted through the PDCCH, and when the control informationis transmitted through the PDSCH, the PDSCH may be received. In thiscase, the signal measurement device of the present disclosure mayreceive the PDCCH of downlink first, and thereafter, attempt to receivethe PDSCH on which control information is transmitted.

The signal measurement device of the present disclosure can receive aforward signal transmitted from the base station to the terminal, thatis, a downlink signal, and thereafter, identify when an uplink may betransmitted and which resource the uplink may be transmitted over, andwhich RNTI the terminal has at that time.

Each uplink signal receiver can check whether an uplink signal that maybe transmitted is present for the uplink resource identified throughthis process, at step S720. This process may include to determinewhether a terminal that may transmit uplink is present, and which RNTIthe terminal has, through control information transmitted on downlink.That is, when each uplink signal receiver determines that an uplinksignal transmission may be performed, each uplink signal receiver cancollect the uplink signal transmitted to a base station through thecorresponding uplink resource, and based on the collected uplink signal,determine whether the uplink signal is transmitted.

When it is determined that an uplink signal transmission may beperformed, at step S720-Y, each of one or more uplink signal receiversincluded in the signal measurement device can attempt to receive theuplink signal for collecting the uplink signal, at step S730.

Further, each uplink signal receiver included in the signal measurementdevice can determine whether the uplink signal is transmitted, at stepS740.

On the other hand, when it is determined that an uplink signaltransmission may not be performed, at step S720-N, the device waitsuntil next control information is received without performing a separateuplink signal collecting operation.

This operation may be performed continuously in each TTI. Further, thesignal measurement device can identify the presence or absence of aterminal, a location of the terminal, and mobility information thereofbased on the presence or absence of the uplink signal transmission,which is determined based on the signal collected by each uplink signalreceiver.

The above process may be performed based on information on an RNTI of aterminal. That is, the signal measurement device can determine whetheran uplink signal transmitted only from a terminal having a specific RNTIis transmitted, and identify the presence or absence of the terminalhaving the specific RNTI, a location of the terminal, and mobilityinformation of the terminal.

FIG. 8 is a flow chart to show a method of detecting the presence orabsence of an uplink signal according to one aspect of the presentdisclosure.

Referring to FIG. 8 , a signal measurement device can acquiretransmission information of uplink from a reception signal of downlinkacquired through a downlink signal receiver. Thereafter, based on theacquired uplink transmission information, the signal measurement devicecan collect an uplink signal transmitted from a terminal to a basestation through a resource assigned on uplink, and calculate averagereception power of the collected signal, at step S810.

The signal measurement device can compare a calculated average receptionpower value with a threshold value calculated or set in advance, at stepS820. When the average reception power value is greater than thethreshold value through the comparing, at step S820-Y, since the uplinksignal has been received, it can be determined that a terminal whoselocation is required to be measured is placed in the vicinity of thedevice, at step S840. On the other hand, when the average receptionpower value is smaller than the threshold value, at step S820-N, sincethe uplink signal is not received, it can be determined that a terminalwhose location is required to be measured is not placed in the vicinityof the device, at step S830.

In the above process, power of a reference signal, which is a pilotsignal, transmitted over an uplink PUCCH or PUSCH may be used forcalculating a reception power value of uplink. In another method, powerof a data signal transmitted over the uplink PUCCH or PUSCH may be usedfor calculating a reception power value of the uplink. Further, thepresence or absence of a terminal and the location information of theterminal can be identified by combining power values of the referencesignal and the data signal. Further, such information may be determinedusing reception power of an uplink SRS transmitted by a target terminal.

FIG. 9 is a flow chart to show an embodiment in which a signalmeasurement device of the present disclosure detects a signal of atarget terminal. Referring to FIG. 9 , the signal measurement device ofthe present disclosure can receive RNTI information of a target terminalfrom a mobile communication system, a base station, or a server, at stepS901. Further, the signal measurement device can acquire information ontransmission formats of a PDCCH or/and a PDSCH on which controlinformation for the target terminal is transmitted, at step S902. Theembodiment of FIG. 9 shows that the information on the transmissionformat is received from the mobile communication system; however,embodiments of the present disclosure are not limited thereto. Forexample, the above process may be performed using information defined inadvance between the base station of the mobile communication system andthe signal measurement device of the present disclosure. The signalmeasurement device of the present disclosure can measure the presence orabsence of a target terminal, a distance therefrom, and locationinformation by receiving a downlink signal and an uplink signal in eachTTI. The signal measurement device can receive the corresponding PDCCHbased on the transmission format information received in advance, atstep S903. The signal measurement device can determine whether controlinformation to be transmitted on the PDSCH is present, at step S904.When it is determined that control information to be transmitted on thePDSCH is not present, the signal measurement device can determinewhether uplink resource assignment is present, at step S908. When it isdetermined that the uplink resource assignment is present, the signalmeasurement device can attempt to detect a signal from a target terminalcorresponding to this, at step S910. When it is determined that controlinformation to be transmitted on the PDSCH is present, the signalmeasurement device can receive the control information using thetransmission format information of the PDCCH and the PDSCH received inadvance, at step S905. Further, the signal measurement device candetermine whether uplink resource assignment is present, at step S906.When the uplink resource assignment is present, the signal measurementdevice can attempt to detect a signal from the target terminal for this,at step S907.

The signal measurement device of the present disclosure is a deviceincluding a downlink signal receiver and one or more uplink signalreceivers. The signal measurement device can acquire uplink resourceassignment information by receiving control information via the downlinksignal receiver, determine whether an uplink signal transmitted by aterminal to a base station is present based on the acquired information,and determine the presence or absence of the terminal and locationinformation.

Based on this, the signal measurement device can acquire the presence orabsence of a terminal whose location is required to be measured, alocation of the terminal, mobility information thereof, and the like.Further, this process may be performed without affecting existingcommunication networks at all.

FIG. 10 is a flow chart to show operation of a base station according toone aspect of the present disclosure.

Referring to FIG. 10 , a method of the present disclosure includes aterminal information determination step S1010 of determining whether aterminal is a target terminal whose location is required to be measured,and a transmission configuration determination step S1020 of determininga configuration for transmitting control information for the terminalbased on a result of the determination.

Specifically, the base station of the present disclosure can determinewhether a terminal is a target terminal whose location is required to bemeasured or a normal terminal whose location is not required to bemeasured, at step S1010.

In one embodiment, the base station can determine whether a terminal isa target terminal whose location is required to be measured, or a normalterminal whose location is not required to be measured based on arequest signal received from one or more signal measurement devicesmeasuring a location of the terminal.

In another embodiment, when a request signal is received from aterminal, the base station can determine that the terminal is a targetterminal whose location is required to be measured.

In another embodiment, the base station can determine whether a terminalis a target terminal whose location is required to be measured, or anormal terminal whose location is not required to be measured based on arequest signal received from an external server.

Further, the base station of the present disclosure can determine aconfiguration for transmitting control information for the terminalbased on a result of the determination of the terminal informationdetermination step, at step S1020. When the terminal is the terminalwhose location is required to be measured, the base station candetermine the configuration for transmitting control information for theterminal considering a state of a signal measurement device measuring alocation of the terminal, such as a location, a channel state, and thelike, as well as a state of the terminal. In the other hand, when theterminal is a normal terminal whose location is not required to bemeasured, the base station can determine to transmit control informationfor the terminal considering only a state of the terminal.

Specifically, when the terminal is determined as the target terminal,the base station can determine at least one of a control channel element(CCE) aggregation level for transmitting control information for theterminal, a modulation and coding scheme (MCS), the amount of resources,the number of bits of transmission data, the minimum number of timesthat HARQ transmission is required to be performed, transmission power,and a scrambling configuration for a PDCCH.

In one embodiment, when the terminal is determined as the targetterminal, the base station can determine a CCE aggregation level basedon a CCE aggregation level considering a minimum CCE aggregation leveland a channel state of the terminal.

In another embodiment, when it is determined that the terminal is thetarget terminal, the base station can determine to transmit controlinformation for the terminal using transmission power greater than firsttransmission power. Here, the first transmission power indicates anamount of transmission power that the signal can reach a location of theterminal, and the transmission of control information for the terminalby the base station using transmission power greater than the firsttransmission power denotes that the control information is transmittedusing an amount of power enabling an information collection device, suchas a signal measurement device, located farther than the terminal toreceive a signal. For example, the base station can transmit a signalusing maximum transmission power capable of enabling a signal to reach afarthest location of the coverage of the base station.

In another embodiment, when it is determined that the terminal is thetarget terminal, the base station can configure scrambling for the PDCCHnot to use identifier information of the terminal.

Further, an nID may be configured to be equal to, or in the same manneras, information of a cell ID. The base station can provide thisconfiguration to the signal measurement device of the presentdisclosure.

In another embodiment, when it is determined that the terminal is thetarget terminal, the base station can determine to transmit a higherlayer parameter used for scrambling for the PDCCH and identifierinformation of the terminal to the signal measurement device. That is,the base station performs scrambling using a function of using RNTIinformation and using nID information, and provides related informationto the device of the present disclosure in advance. Alternatively, thisinformation may be defined in advance between the base station and thesignal measurement device of the present disclosure. The signalmeasurement device according to embodiments of the present disclosureperforms a reception for the PDCCH based on scrambling information onthe PDCCH.

In LTE system, uplink resource assignment information may be transmittedover the PDSCH, as well as the PDCCH. In this case, downlink resourceassignment information may be transmitted over the PDCCH, andthereafter, uplink resource assignment information and information on atransmission period, and the like may be transmitted over the PDSCH.Generally, the control for uplink transmission performed through thePDSCH may be, for example, a configuration for the PUCCH, periodicsignal transmission through the uplink, semi-persistent scheduling.

When the base station transmits uplink resource assignment for a targetterminal over the PDSCH, since the signal measurement device of thepresent disclosure cannot identify the resource assignment, for example,which type of the resource assignment is transmitted, there is a problemthat the signal measurement device is required to attempt to receive allPDSCHs transmitted to the target terminal. This may cause the complexityof the signal measurement device of the present disclosure to increase.In the present disclosure, when a base station transmits a PDSCH foruplink resource assignment to a target terminal, a data transmissionscheme, such as an available modulation and coding scheme (MCS), theamount of resources, the number of bits of transmission information, atransmission scheme, and the like may be defined in advance. Forexample, the PDSCH may be transmitted using an IMCS, which is an MCSindex, less than or equal to a predetermined IMCS. In one embodiment,the MCS index for transmitting the PDSCH may be limited to between 1 and5. In another embodiment, the MCS index for transmitting the PDSCH maybe limited to only 0 or 1. In further another embodiment, the MCS indexfor transmitting the PDSCH may be limited to only 0. Further, when oneblock is transmitted, the number of bits of control information relatedto uplink resource assignment allowed to be transmitted may be limitedwithin a predetermined number of bits. Further, when control informationis transmitted, the control information may be defined to be transmittedin only a transmission antenna diversity mode.

In the present disclosure, in order to improve a probability that asignal measurement device successfully receives PDSCH informationtransmitted to a target terminal, even when the target terminalsuccessfully has decoded this, the base station can additionally performthe HARQ. That is, the minimum number of times that HARQ transmission isrequired to be performed may be defined in advance, and even when thetarget terminal transmits an ACK, the base station may continuallyperform the HARQ operation until the minimum number of times is reached.

In one embodiment, the method of present disclosure may further includea communication step of communicating with one or more signalmeasurement devices measuring a location of a terminal. The base stationcan receive channel state information of the signal measurement devicefrom the signal measurement device, and determine a configuration fortransmitting control information for the terminal based on a resultdetermined in the terminal information determination step and thechannel state information of the signal measurement device.Specifically, the signal measurement device of the present disclosurecan periodically, or aperiodically, provide a state of a forward channelto a mobile communication system or a base station. Further, based onthis, the base station may change information on transmission schemes ofthe control channel and the data channel, and additionally provide thisto the signal measurement device of the present disclosure. In thismanner, information on a scheme for transmitting control information toa target terminal may be changed depending on a channel state of thesignal measurement device.

In one embodiment, the method of the present disclosure may furtherinclude a communication step of communicating with the signalmeasurement device measuring a location of a terminal. Specifically, thebase station may transmit, to a signal measurement device, at least oneof a CCE aggregation level, an MCS, the amount of resources, the numberof bites of transmission data, the minimum number of times that HARQtransmission is required to be performed, transmission power, and ascrambling configuration for a PDCCH.

Further, in a communication system including one or more base stations,one or more target terminals whose locations are required to be measuredand whose presence or absence is required to be determined, one or moresignal measurement devices detecting a signal transmitted by the targetterminal according to embodiments of the present disclosure, the signalmeasurement device can define information on a transmission format fortransmitting control information to the target terminal in advance withthe base station, and thereafter, considering the predefinedtransmission format, receive control information transmitted to thetarget terminal on downlink. That is, the base station can share atleast one of a CCE aggregation level, an MCS, the amount of resources,the number of bites of transmission data, the minimum number of timesthat HARQ transmission is required to be performed, transmission power,and a scrambling configuration for a PDCCH in advance with the signalmeasurement device.

When the method of the present disclosure is used, reduce the complexityof the signal measurement device receiving control information can bereduced and a performance of the signal measurement device for receivingthe control information transmitted to a target terminal can beimproved.

In the present disclosure, a signal measurement device in the vicinityof a target terminal can detect an uplink signal transmitted by thetarget terminal, and measure the detected uplink signal. In order forthe signal measurement device of the present disclosure to detect theuplink signal transmitted by the target terminal in the fartherdistance, or measure it accurately, it is necessary for a base stationto configure a transmission format, an MCS, and transmission power ofuplink transmitted to the target terminal to be different from those fora normal terminal.

In one embodiment, by configuring an MCS or a bandwidth of an uplinksignal transmitted by a target terminal to be different from that of anormal terminal, the signal measurement device of the present disclosurecan thus detect the uplink signal from the target terminal moreefficiently. Further, HARQ transmission for the target terminal may beoperated to be different from that for a normal terminal.

When uplink resource assignment is needed to do this, the base stationmay determine whether a terminal for which the resource assignment isrequired is a normal terminal or a target terminal. If the resourceassignment is for a normal terminal, the base station can perform theresource assignment using transmission types, such as an MCS,transmission power, a bandwidth, and the like, and correspondingparameters, which can satisfy the QoS of the terminal. However, on theother hand, if the resource assignment is for a target terminal, thebase station can perform the resource assignment so that the signalmeasurement device of the present disclosure can detect a correspondinguplink signal more efficiently.

When the base station of present disclosure performs resource assignmentfor a target terminal, the base station can assign a bandwidth broaderthan a bandwidth needed for a data transmission of a normal terminal toa PUSCH which is an uplink channel. In this case, the base station canassign a bandwidth greater than or equal to a minimum bandwidth definedin advance to the uplink channel, and transmit correspondinginformation. In this case, the assignment of the bandwidth for thetarget terminal may be performed only in a period of time defined inadvance, and a bandwidth assigned for a normal terminal may be assignedfor the remaining period of time.

In another method, an uplink channel transmitted by a target terminalmay be configured with an MCS different from that assigned for a normalterminal. For example, an MCS of a PUSCH transmitted by a targetterminal may be configured as a level lower than or equal to apredetermined level, and thus, an uplink signal transmission may beperformed using the low MCS. In one embodiment, the PUSCH may betransmitted using a lowest MCS.

In another method, the HARQ of the PUSCH for a target terminal may beimplemented differently from that implemented for a normal terminal. Incase of the HAQR of a normal terminal, when a base station successfullyreceives data, the base station does not request the transmit of anuplink signal for the same data any more, but in the present disclosure,even when the base station successfully receives data, the base stationcan additionally request the transmit of an uplink signal for the samedata. This is for the purpose of enabling the signal measurement deviceof the present disclosure to easily detect and measure signals from atarget terminal by enabling the target terminal to repeatedly transmituplink signals in a similar pattern. For example, a target terminal maybe requested to perform HAQR transmission greater than or equal to N1times in a specific time period, or in a specific pattern, for a targetterminal. Here, N1 is a value defined in advance between the basestation and the signal measurement device. In one embodiment, HARQtransmission may be configured to be performed a maximum number of timesthat HARQ transmission can be performed.

Further, according to embodiments of the present disclosure, a basestation can configure transmission power performed by a target terminalto have a level higher than transmission power performed by a normalterminal so that a signal measurement device can detect an uplink signalfrom a target terminal in the farther distance and measure itaccurately. The base station can determine whether a terminal requiredto receive resource assignment is a normal terminal or a targetterminal, and based on the determination, configure power transmitted bythe target terminal to be different from power transmitted by the normalterminal. In one embodiment, uplink power transmitted by a targetterminal may be configured to be greater than uplink power transmittedby a normal terminal. As a result of this configuration, an uplinksignal from the target terminal with a greater level than an uplinksignal from a normal terminal may be received by a receiver of the basestation (based on power received in a same bandwidth in a same timeperiod). Further, an uplink signal transmitted by a target terminal maybe also configured to be transmitted with greater power than one or moreother time periods in a time period defined in advance.

In the LTE system, when a terminal transmits an uplink signal,transmission power may be determined by various parameters. In oneembodiment, a base station can set a parameter related to transmissionpower of a target terminal to be different from a parameter set to anormal terminal. The transmission power of the target terminal may beset to be greater than the transmission power of the normal terminal.

In the case of the LTE system, a PUCCH, a PUSCH, an SRS, and the likemay be configured as an uplink channel for enabling a target terminal totransmit a signal. The uplink transmission power of the terminal can becontrolled by using different parameters for each channel.

In the case of the PUCCH, PO_PUCCH may be configured to be different foreach terminal. That is, this means that PO_PUE_PUCCH is configureddifferently for each terminal. In another method, a modification valuemay be set through power control so that each terminal can havedifferent δPUCCHs. In another example, a power control command may betransmitted so that a g(i) value can have different values for eachterminal.

In the case of the PUSCH, PO_PUSCH may be configured to be different foreach terminal. That is, this means that PO_PUE_PUSCH is configureddifferently for each terminal. This value may be set to have a differentvalue according to whether a transmitted PUSCH is based onsemi-persistent scheduling, dynamic assignment, or a grant of randomaccess. When setting all or at least a part of the values describedabove, a target terminal may be set to have a value different from anormal terminal. Further, when setting one or more of these values, atarget terminal may be set to have a value greater than a normalterminal. In another method, a modification value may be set throughpower control so that each terminal can have different δPUSCHs. Thisenables f(i) in transmission power to have a different value.

If after an SRS is transmitted, it is desired to detect an uplink signalof a target terminal based on this, power control may be performedthrough a configuration of PSRS_OFFSET or PO_PUSCH. That is, whensetting one or more of the values described above, a target terminal maybe set to have a value different from a normal terminal. In oneembodiment, one or more of these values set to a target terminal mayhave a value greater than one or more of the values set to a normalterminal. In another example, a power control command may be transmittedso that f(i) in transmission power to have a different value.

In the present disclosure, discussions have been conducted on theembodiments of methods in which a base station configures a targetterminal to transmit a signal with power higher than a normal terminal.However, the transmission of the signal with the high power may includethat not only is the signal continually transmitted with the high power,but a parameter and power control command is set so that transmissionpower of a target terminal can have a value higher than transmissionpower of a normal terminal in a specific period. That the transmissionpower is high may include that not only is power actually transmittedhigh, but a signal is transmitted with higher power when the signal istransmitted using an identical channel, an identical MCS, and the like.

When the signal measurement device of the present disclosure identifiesa location of a target terminal, various methods may be used. Forexample, a time delay of radio-propagation based on an arrival time atwhich a signal is received may be used. Further, a distance can bemeasured based on the propagation attenuation of a signal. In anothermethod, a direction in which a signal is received may be used.

Propagation attenuation of an uplink signal may be used when a signalmeasurement device determines a location of a target terminal. In thiscase, if the signal measurement device knows in advance transmissionpower with which the uplink signal is transmitted by the targetterminal, the signal measurement device can measure a location of thetarget more accurately.

To do this, the base station of the present disclosure can calculatetransmission power of an uplink signal transmitted by the targetterminal, and transmit measurement results to a signal measurementserver. The base station can calculate power transmitted by the targetterminal using various methods. For example, the target terminal cantransmit a power headroom report periodicity or aperiodically forcalculating of the transmission power from the target terminal. The basestation can calculate transmission power of a signal transmitted by thetarget terminal based on this information. This information may betransmitted to the location measurement server. Further, thisinformation may be transmitted to a signal measurement device of thepresent disclosure.

When the base station transmits the information on the transmissionpower of the target terminal to the location measurement server, thelocation measurement server can measure propagation attenuation betweenthe target terminal and the signal measurement device based on thetransmission power of the target terminal. In this case, the locationmeasurement server can receive the transmission power information of thetarget terminal from the base station, and calculate correspondingpropagation attenuation by receiving reception power information of thetarget terminal from one or more signal measurement devices. Propagationattenuation between the target terminal and a j-th signal measurementdevice may be calculated based on the following equation.

Propagation attenuation (j)=reception power of a signal from a targetterminal (j)−transmission power of the target terminal.  [Equation 1]

Here, j is an index of signal measurement devices.

In another method, the base station can transmit the transmission powerinformation of the target terminal to each signal measurement device.This may be implemented such that the base station transmits theinformation to the location measurement server, and then the locationmeasurement server transmits this to the signal measurement devices. Inthis case, each signal measurement device can calculate propagationattenuation between the target terminal and the signal measurementdevice based on the transmission power information of the targetterminal received from the base station and reception power informationof the target terminal measured by the signal measurement device itself.Propagation attenuation (j) between the target terminal and the j-thsignal measurement device may be calculated based on the Equation 1.

In the above process, although the embodiments in which a base stationtransmits transmission power information of a target terminal have beendiscussed, it should be noted that these embodiment can be implementedin a manner that one or more parameters related to transmission powerincluding a power headroom report of the target terminal are transmittedto a location measurement server or one or more signal measurementdevices of the present disclosure, and the location measurement serveror the signal measurement device calculates the transmission power ofthe target terminal.

FIG. 11 is a flow chart to show a method of uplink resource assignmentand power control of a base station according to one aspect of thepresent disclosure. Referring to FIG. 11 , the base station candetermine whether a terminal to which uplink resource assignment isperformed is a target terminal or a normal terminal, at step S1110. Whenthe terminal is not the target terminal whose location is required to bemeasures, a parameter considering a channel state of the terminal can beset, at step S1120. That is, when resource assignment is for a normalterminal, QoS-based normal resource assignment and HARQ operation may beperformed. Further, a parameter related to uplink transmission power maybe set such that the uplink power is transmitted with a setting for thenormal terminal. Such a transmission power parameter may be persistentlyused in a predetermined period or longer in a state where it is presetrather than being performed per resource assignment. Further, whenresource assignment for an uplink channel is performed, in the case ofthe normal terminal, the resource assignment can be performedconsidering Quality of Service (QoS) of the channel transmitted by theterminal, at step S1130. On the other hand, when the terminal is thetarget terminal whose location is required to be measured, atransmission power parameter can be set so that the signal measurementdevice of the present disclosure can easily detect and measure in thefarther distance, at step S1140. Further, corresponding resourceassignment can be performed so that the signal measurement device caneasily detect and measure, at step S1150. As an example of the resourceassignment for the target terminal, a predetermined bandwidth or moremay be assigned, or the resource assignment may be performed to transmitusing a predefined MCS or less. In order to improve a receptionprobability of the signal measurement device, the base station canperform HARQ retransmission greater than or equal to a minimum number oftimes that transmission is required to be performed, at step S1160.Further, the resource assignment for the target terminal may beperformed only in one or more time periods rather than being applied toall TTIs. Further, information on the one or more time periods may beshared between the base station and the signal measurement device of thepresent disclosure, and thus, corresponding operation may be performedbased on the shared information.

FIG. 12 is a block diagram illustrating operation of a locationmeasurement server according to one aspect of the present disclosure.Referring to FIG. 12 , the location measurement server includes acommunication unit 1210, and a propagation attenuation and locationcalculation unit 1220. Specifically, the communication unit 1210 canreceive a parameter related to a transmission power configuration of atarget terminal from a base station of a mobile communication network.This parameter may include information related to the transmission powerof the terminal calculated by the base station through a power headroomreport from the target terminal. Further, the communication unit 1210 ofthe location measurement server can receive information on powerreceived from the target terminal from a signal measurement device ofthe present disclosure. The propagation attenuation and locationcalculation unit 1220 of the location measurement server can calculatepropagation attenuation between the target terminal and each signalmeasurement device based on the information. Further, the propagationattenuation and location calculation unit 1220 can calculate a locationof the target terminal using the information on the propagationattenuation.

The terms “system”, “processor”, “controller”, “component”, “module”,“interface”, “model”, “unit”, and the like, may generally refer tocomputer-related entity hardware, a combination of hardware andsoftware, software, or software in execution. For example, such elementsdescribed above may be, but not limited to, a process driven by theprocessor, a control processor, an entity, a running thread, a programand/or a computer. For example, when an application runs on a controlleror a processor, all of the application, the controller or the processorcan become one element. One or more components can be included within aprocess and/or thread of execution, and a component can be placed on onesystem or be disposed on more than one system.

The standardized specifications or standard documents related to theembodiments described above constitute a part of the present disclosure.Accordingly, it should be construed that the incorporation of thecontent of the standardized specifications and part of the standarddocuments into the detailed description and claims is included withinthe scope of the present disclosure.

Although a preferred embodiment of the present disclosure has beendescribed for illustrative purposes, those skilled in the art willappreciate that various modifications, additions and substitutions arepossible, without departing from the scope and spirit of the inventionas disclosed in the accompanying claims. Therefore, exemplary aspects ofthe present disclosure have not been described for limiting purposes,but to describe the embodiments, the therefore, the scope of the presentdisclosure shall not be limited to such embodiments. The scope ofprotection of the present disclosure should be construed based on thefollowing claims, and all technical ideas within the scope ofequivalents thereof should be construed as being included within thescope of the present disclosure.

What is claimed is:
 1. A base station comprising: a terminal informationdetermination unit configured to determine whether a terminal is atarget terminal whose location is required to be measured; and atransmission configuration determination unit configured to determineuplink resource allocation information for the terminal based on aresult of the determination, wherein the uplink resource allocationinformation that improves a reception performance at a signalmeasurement device for an uplink signal transmitted by the targetterminal compared with the reception performance at the signalmeasurement device for the uplink signal transmitted by another terminalwhich is not the target terminal.
 2. The base station according to claim1, wherein the terminal information determination unit determineswhether the terminal is the target terminal whose location is requiredto be measured based on a request signal received from a signalmeasurement device measuring the location of the terminal or a serverwhich has location information of the signal measurement device.
 3. Thebase station according to claim 1, wherein the transmissionconfiguration determination unit, when the terminal is determined as thetarget terminal, determines the uplink resource allocation informationfor the terminal based on at least one of the location information ofthe signal measurement device or the channel quality between the signalmeasurement device and the target terminal.
 4. The base stationaccording to claim 1, wherein the transmission configurationdetermination unit, when the terminal is determined as the targetterminal, determines the uplink resource allocation information in whichan uplink signal bandwidth transmitted by the target terminal isallocated wider than the uplink signal bandwidth transmitted by theanother terminal which is not the target terminal.
 5. The base stationaccording to claim 4, wherein the transmission configurationdetermination unit determines the uplink resource allocation informationso that the uplink signal bandwidth transmitted by the target terminalis set to be wider than a preset minimum bandwidth, or wider than theuplink signal bandwidth transmitted by the another terminal which is notthe target terminal for a predetermined time interval.
 6. The basestation according to claim 1, wherein the transmission configurationdetermination unit, when the terminal is determined as the targetterminal, determines the uplink resource allocation information thatincludes an MCS assigned to the uplink signal transmitted by the targetterminal different from an MCS assigned to the uplink signal transmittedby the another terminal which is not the target terminal.
 7. The basestation according to claim 1, wherein the transmission configurationdetermination unit, when the terminal is determined as the targetterminal, assigns the uplink resource allocation information to thetarget terminal such that HARQ process is performed by at least onepreset number.
 8. The base station according to claim 1, wherein thetransmission configuration determination unit, when the terminal isdetermined as a target terminal, determines the uplink resourceallocation information that allows higher uplink transmission power fromthe target terminal than the uplink transmission power from anotherterminal which is not the target terminal.
 9. The base station accordingto claim 8, wherein the base station further comprises a communicationunit configured to transmit information on the transmission power of theuplink signal transmitted by the target terminal to the signalmeasurement device or a server communicating with the signal measurementdevice.
 10. A method comprising: determining whether a terminal is atarget terminal whose location is required to be measured; anddetermining uplink resource allocation information for the terminalbased on a result of the determination, wherein the uplink resourceallocation information that improves reception performance at a signalmeasurement device for the uplink signal transmitted from the targetterminal compared with the reception performance at the signalmeasurement device for the uplink signal transmitted from anotherterminal which is not the target terminal.
 11. The method according toclaim 10, wherein the determining uplink resource allocation informationcomprises, when the terminal is determined as the target terminal,determining the uplink resource allocation information that allowshigher uplink transmission power from the target terminal than theuplink transmission power from the another terminal which is not atarget terminal.
 12. A location measurement server comprising: acommunication unit configured to receive information on transmissionpower of an uplink signal transmitted by a target terminal from a basestation, and receive information on reception power of the uplink signaltransmitted by the target terminal from a signal measurement device; anda location calculation unit configured to determine location informationof the target terminal based on the information on the transmissionpower of the uplink signal and the information on the reception power ofthe uplink signal or to determine the propagation attenuation betweenthe signal measurement device and the target terminal.
 13. The locationmeasurement server according to claim 12, wherein the locationinformation includes the distance between the target terminal and thesignal measurement device.
 14. The location measurement server accordingto claim 12, wherein the information on the transmission power of theuplink signal includes at least one parameter used to determine thetransmission power of the uplink signal, and a value of the at least oneparameter is determined based on a power headroom report of the targetterminal.
 15. A signal measurement device comprising: a communicationunit configured to receive information on transmission power of anuplink signal transmitted from a target terminal; one or more uplinksignal receivers configured to receive the uplink signal of the targetterminal based on the resource allocation information; and a controllerconfigured to determine location information of the target terminal orpropagation attenuation between the target terminal and the signalmeasurement device based on the information on transmission power andthe uplink signal of the target terminal received through the one ormore uplink signal receivers.
 16. The signal measurement deviceaccording to claim 15, wherein the location information includes thedistance between the target terminal and the signal measurement device.